This stress-engineered, lightweight yet durable, ABS plastic tray is held by a strong galvanized steel table frame with injection molded plastic corners. American Ebb & Flo Trays and Frames are time-tested for durability. The gutter pattern was specially designed to support the weight of all plants and a full tank of water without sagging in the middle. The unique design was engineered to allow quick and complete drainage. The Fitting Kit includes one custom bulkhead fitting with 1/2” screen, nut and O-ring (fill/drain fitting) and one overflow fitting.